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Dynamical Heterogeneity close to the Jamming Transition in a Sheared Granular Material | | O. Dauchot
; G. Marty
; G. Biroli
; | | Date: |
6 Jul 2005 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | Abstract: | The dynamics of a bi-dimensionnal dense granular packing under cyclic shear is experimentally investigated close to the jamming transition. Measurement of multi-point correlation functions are produced. The intermediate scattering function and its self-part, displaying slower than exponential relaxation, suggest dynamic heterogeneity. Further analyses of four point correlation functions reveal that the grain relaxations are strongly correlated and spatially heterogeneous, especially at the time scale of the collective rearrangements. Finally, a dynamical correlation length is extracted from spatio-temporal pattern of mobility. Our experimental results open the way to a systematic study of dynamic correlation functions in granular materials. | | Source: | arXiv, cond-mat/0507152 | | Other source: | [GID 732524] pmid16486371 | | Services: | Forum | Review | PDF | Favorites | |
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